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CS5461A
9. BASIC APPLICATION CIRCUITS
Figure 15 shows the CS5461A configured to measure
power in a single-phase, 2-wire system while operating
in a single-supply configuration. In this diagram, a shunt
resistor is used to sense the line current and a voltage
divider is used to sense the line voltage. In this type of
shunt resistor configuration, the common-mode level of
the CS5461A must be referenced to the line side of the
power line. This means that the common-mode poten-
tial of the CS5461A will track the high-voltage levels, as
well as low-voltage levels, with respect to earth ground
potential. Isolation circuitry is required when an earth-
ground-referenced communication interface is connect-
ed.
Figure 16 shows the same single-phase, two-wire sys-
tem with complete isolation from the power lines. This
isolation is achieved using three transformers: a general
purpose transformer to supply the on-board DC power;
a high-precision, low-impedance voltage transformer
with very little roll-off/phase-delay, to measure voltage;
and a current transformer to sense the line current.
Figure 17 shows a single-phase, 3-wire system. In
many 3-wire residential power systems within the Unit-
ed States, only the two line terminals are available (neu-
tral is not available). Figure 18 shows the CS5461A
configured to meter a three-wire system with no neutral
available.
5 k ?
10 k ?
N
120 VAC
L
500 ?
500
10 ?
470 nF
470 μF
0.1 μF
14
3
0.1 μF
VA+
CS5461A
VD+
R 2
R 1
C V-
C Vdiff
9
VIN+
PFMON
CPUCLK
XOUT
17
2
1
4.096 MHz
R V-
C V+
10
VIN-
XIN
24
Optional
Clock
Source
15
IIN-
R Shunt
R I-
R I+
C I-
C I+
C Idiff
16
IIN+
RESET
CS
SDI
SDO
SCLK
19
7
23
6
5
Serial
Data
Interface
12
11
VREFIN
VREFOUT
INT
E2
20
22
21
0.1 μF
Note:
Indicates common (floating) return.
AGND
13
DGND
4
E1
Mech. Counter
or
Stepper Motor
Figure 15. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)
DS661F3
39
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